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The role of rubber powder and cellulose in ceramic tile adhesive

Latex powder-improves the consistency and smoothness of the system in the wet mixing state. Due to the characteristics of the polymer, the cohesion of the wet mixing material is greatly improved and contributes greatly to the workability. After drying, it provides adhesion to smooth and compact surface layer, improves the interface effect of sand, gravel and pores, and can form a film at the interface under the premise of ensuring the addition amount, so that tile adhesive has certain flexibility and reduces elastic modulus, the heat deformation stress is absorbed to a large extent. In case of water immersion in the later period, there are also stresses such as waterproof, buffer temperature and inconsistent material deformation (ceramic tile deformation coefficient 6 × 10-6/℃, cement concrete deformation coefficient 10 × 10-6/℃) to improve weather resistance. Hydroxypropyl methyl cellulose HP cellulose --- provides good water retention and workability for new mortar, especially for the wetting area. In order to ensure the smooth progress of the hydration reaction, the substrate can be prevented from excessive water absorption and surface water evaporation. Due to its air entraining (1900g/L ---- 1400g/LPO400 sand 600HP cellulose 2), the bulk density of tile glue is reduced, materials are saved and the elastic modulus of hardened mortar body is reduced.

Ceramic tile adhesive redispersible latex powder is a green environmental protection, building energy saving, high-quality multi-purpose powder building materials, is an essential and important functional additives for dry mixed mortar. It can improve the performance of mortar, improve the strength of mortar, improve the bonding strength of mortar and various substrates, improve the flexibility and variability of mortar, compressive strength, flexural strength, wear resistance, toughness, adhesion and water retention capacity, constructability. The performance of tile adhesive redispersible latex powder is relatively strong, and the tile adhesive redispersible latex powder has high bonding ability and unique performance. Therefore, their application range is extremely wide. Hydroxypropyl methyl cellulose plays the role of water retention, thickening and construction performance in the early stage, and the ceramic tile adhesive can redisperse latex powder plays the later strength, which plays a good effect on the firmness, acid and alkali resistance of the project. The effect of ceramic tile adhesive redispersible latex powder on fresh mortar: prolong the working time and adjustable time to improve the water retention performance, so as to ensure the hydration of cement and improve the sagging resistance (special modified rubber powder) and improve the workability (easy to construct on the substrate, easy to press ceramic tiles into the adhesive). The effect of ceramic tile adhesive on hardened mortar has good adhesion with various substrates, including concrete, plastering, wood, old tiles, PVC uniform in all kinds of climatic conditions, there is a good deformation capacity.
2022.5.6group
The addition of tile adhesive redispersible latex powder has a very obvious effect on the improvement of the performance of cement-based tile adhesive, and has a significant effect on the bonding strength, water resistance and aging resistance of the adhesive. At present, there are many types of tile adhesive redispersible latex powder on the market, such as acrylic redispersible latex powder, styrene-acrylic rubber powder, vinyl acetate-ethylene copolymer, etc. Generally speaking, the tile adhesive redispersible latex powder used in the market is mostly vinyl acetate-ethylene copolymer.
(1) With the increase of cement content, the original strength of ceramic tile adhesive redispersible latex powder increased, and at the same time, the tensile adhesive strength after immersion and the tensile adhesive strength after thermal aging also increased. Considering that the properties of tile adhesive redispersible latex powder meet the standard requirements, the cement dosage should be above 35%.
(2) With the increase of the amount of ceramic tile adhesive redispersible latex powder, the tensile bond strength of ceramic tile adhesive redispersible latex powder after water immersion and the tensile bond strength after thermal aging increased, but the tensile bond strength after thermal aging increased more obviously.

Because ceramic tiles have good decorative and functional properties, such as durability, waterproof and easy to clean, its application is very common: including walls, floors, ceilings and swimming pools, and can be used indoors and outdoors. The traditional method of pasting ceramic tiles is the thick layer construction method, that is, the ordinary mortar is first applied to the back of the ceramic tile, and then the ceramic tile is pasted on the base layer. The thickness of the mortar layer is about 10 to 30mm. Although this method is very suitable for construction on the uneven base, but the disadvantage is the low efficiency of tiling, the high technical proficiency of workers, due to the poor flexibility of the mortar, increased the risk of falling off and the construction site is difficult to strictly control the quality of the mortar. This method is only suitable for high water absorption tiles, and the tiles need to be soaked in water before pasting the tiles in order to achieve sufficient bond strength.

At present, the tiling method widely used in Europe is the so-called thin-layer sticking method, I .e. using a tooth-shaped spatula to scrape the polymer-modified tile adhesive batch onto the surface of the base layer to be tiled in advance to form a mortar layer with raised stripes and uniform thickness, then the tile is pressed on it and slightly twisted, and the thickness of the mortar layer is about 2 to 4mm. Due to the modification effect of cellulose ether and redispersible latex powder, the use of this tile adhesive has good bonding properties for different types of base layers and surface layers including full vitrified bricks with extremely low water absorption, and has good flexibility, so as to absorb the stress caused by temperature difference and other factors, as well as good resistance to vertical flow, long enough open time for thin layer construction can greatly speed up the construction speed, easy to operate and no need to pre wet tiles in water. This construction method is easy to operate and easy to carry out on-site construction quality control.